# @emotion/css The [@emotion/css](https://www.npmjs.com/package/@emotion/css) package is framework agnostic and the simplest way to use Emotion. ## Table of Contents - [Quick Start](#quick-start) - [API](#api) - [Generate Class Names — `css`](#css) - [Global Styles — `injectGlobal`](#global-styles) - [Animation Keyframes — `keyframes`](#animation-keyframes) - [Composing Class Names — `cx`](#cx) - [Custom Instances](#custom-instances) - [Server Side Rendering](https://emotion.sh/docs/ssr#api) - [Babel Plugin](https://emotion.sh/docs/@emotion/babel-plugin) ## Quick Start Get up and running with a single import. ```bash npm install --save @emotion/css ``` ```javascript import { css } from '@emotion/css' const app = document.getElementById('root') const myStyle = css` color: rebeccapurple; ` app.classList.add(myStyle) ``` ## API ### css The `css` function accepts styles as a template literal, object, or array of objects and returns a class name. It is the foundation of emotion. #### String Styles ```jsx // @live import { css } from '@emotion/css' const color = 'darkgreen' render(

This has a hotpink background.

) ``` #### Object Styles ```jsx // @live import { css } from '@emotion/css' const color = 'darkgreen' render(

This has a hotpink background.

) ``` #### Array of Object Styles ```jsx // @live import { css } from '@emotion/css' const color = 'darkgreen' const isDanger = true render(

This has a hotpink background.

) ``` ### Global Styles `injectGlobal` injects styles into the global scope and is useful for applications such as css resets or font faces. ```jsx import { injectGlobal } from '@emotion/css' injectGlobal` * { box-sizing: border-box; } @font-face { font-family: 'Patrick Hand SC'; font-style: normal; font-weight: 400; src: local('Patrick Hand SC'), local('PatrickHandSC-Regular'), url(https://fonts.gstatic.com/s/patrickhandsc/v4/OYFWCgfCR-7uHIovjUZXsZ71Uis0Qeb9Gqo8IZV7ckE.woff2) format('woff2'); unicode-range: U+0100-024f, U+1-1eff, U+20a0-20ab, U+20ad-20cf, U+2c60-2c7f, U+A720-A7FF; } ` ``` ### Animation Keyframes `keyframes` generates a unique animation name that can be used to animate elements with CSS animations. **String Styles** ```jsx // @live import { css, keyframes } from '@emotion/css' const bounce = keyframes` from, 20%, 53%, 80%, to { transform: translate3d(0,0,0); } 40%, 43% { transform: translate3d(0, -30px, 0); } 70% { transform: translate3d(0, -15px, 0); } 90% { transform: translate3d(0,-4px,0); } ` render(

) ``` **Object Styles** ```jsx // @live import { css, keyframes } from '@emotion/css' const bounce = keyframes({ 'from, 20%, 53%, 80%, to': { transform: 'translate3d(0,0,0)' }, '40%, 43%': { transform: 'translate3d(0, -30px, 0)' }, '70%': { transform: 'translate3d(0, -15px, 0)' }, '90%': { transform: 'translate3d(0, -4px, 0)' } }) render(

) ``` ### cx `cx` is emotion's version of the popular [`classnames` library](https://github.com/JedWatson/classnames). The key advantage of `cx` is that it detects emotion generated class names ensuring styles are overwritten in the correct order. Emotion generated styles are applied from left to right. Subsequent styles overwrite property values of previous styles. **Combining class names** ```jsx import { cx, css } from '@emotion/css' const cls1 = css` font-size: 20px; background: green; ` const cls2 = css` font-size: 20px; background: blue; `

``` **Conditional class names** ```jsx const cls1 = css` font-size: 20px; background: green; ` const cls2 = css` font-size: 20px; background: blue; ` const foo = true const bar = false

``` **Using class names from other sources** ```jsx const cls1 = css` font-size: 20px; background: green; `

``` ## Custom Instances With `@emotion/css/create-instance`, you can provide custom options to Emotion's cache. The main `@emotion/css` entrypoint can be thought of as a call to `@emotion/css/create-instance` with sensible defaults for most applications. ```javascript import createEmotion from '@emotion/css/create-instance' export const { flush, hydrate, cx, merge, getRegisteredStyles, injectGlobal, keyframes, css, sheet, cache } = createEmotion() ``` ### Upside - Calling it directly will allow for some low level customization. - Create custom names for emotion APIs to help with migration from other, similar libraries. - Could set custom `key` to something other than `css` ### Downside - Introduces some amount of complexity to your application that can vary depending on developer experience. - Required to keep up with changes in the repo and API at a lower level than if using `@emotion/css` directly ### Primary use cases - Using emotion in embedded contexts such as an `

	Stars	Issues	Version	Updated	Created
@emotion/css			11.10.6	a month ago	5 years ago
@emotion/react			11.10.6	a month ago	3 years ago
material-ui	85,436	1,393	0.20.2	5 years ago	8 years ago
styled-components	38,479	147	5.3.9	14 days ago	7 years ago

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